--- a/hgext3rd/evolve/stablerange.py	Tue Jul 31 12:54:46 2018 +0200
+++ b/hgext3rd/evolve/stablerange.py	Thu Aug 02 01:53:01 2018 +0200
@@ -157,29 +157,29 @@
     @abc.abstractmethod
     def subranges(self, repo, rangeid):
         """return the stable sub-ranges of a rangeid"""
-        raise NotImplemented()
+        raise NotImplementedError()
 
     @abc.abstractmethod
     def revsfromrange(self, repo, rangeid):
         """return revision contained in a range"""
-        raise NotImplemented()
+        raise NotImplementedError()
 
     @abc.abstractmethod
     def depthrev(self, repo, rev):
         """depth a revision"""
         # Exist to allow basic implementation to ignore the depthcache
         # Could be demoted to _depthrev.
-        raise NotImplemented()
+        raise NotImplementedError()
 
     @abc.abstractmethod
     def warmup(self, repo, upto=None):
         """warmup the stable range cache"""
-        raise NotImplemented()
+        raise NotImplementedError()
 
     @abc.abstractmethod
     def rangelength(self, repo, rangeid):
         """number of revision in <range>"""
-        raise NotImplemented()
+        raise NotImplementedError()
 
     def _slicepoint(self, repo, rangeid):
         """find the standard slicing point for a range"""

--- a/hgext3rd/topic/discovery.py	Tue Jul 31 12:54:46 2018 +0200
+++ b/hgext3rd/topic/discovery.py	Thu Aug 02 01:53:01 2018 +0200
@@ -16,7 +16,7 @@
 try:
     from mercurial import wireproto
     wireproto.branchmap
-except ImportError: # <= hg-4.5
+except (AttributeError, ImportError): # <= hg-4.5
     from mercurial import wireprotov1server as wireproto
 
 def _headssummary(orig, pushop, *args, **kwargs):